Bobbin-latch for sewing-machines.



No. 723,170. PATBNTED MAR. 17, 1903.

' WI A BOBBIN LA TGH FOR SEWING MACHINES.

APPLIOATION FILED DEC. 26, 1893. N0 MODEL.

nnlwm mmlum I Wifizesyea UNITED STATES PATENT OFFICE.

WILLIAM .A. MACK, OF NORWALK, OHIO, ASSIGNOR TO THE STANDARD SEWING MACHINE COMPANY, OF CLEVELAND, OHIO, A CORPORA- TION OF OHIO.

BOBBlN- LATC H FOR '8 EWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 723,170, dated March 17, 1903. Application filed December 26,1893. Serial No. 494,635. (No model.)

To all whom it may concern: r I

Be it known that I, WILLIAM A. MACK, a citizen of the United States, and a resident of Norwalk, Huron county, State of Ohio, have invented new and useful Improvements in Bobbin-Case Latches for Sewing-Machines, of which the following is a specification.

This invention relates to that class of sewing-machines employing a rotary or oscillating shuttle in which the bobbin and bobbincase are removably contained, the object of the invention being to provide an improved latch of simple construction and operation for removably retaining the bobbin and bobbin-case in operative position within the shuttle and also forholding the bobbin-case.

in a non-rotatable position relative to the latter. This object I secure by means of the novel construction, arrangement, and combinations of parts, as hereinafter set forth in detail, and pointedvout in the claims.

Referring to the accompanying drawings, formingpart of this specification, Figure 1 is a front end elevationiof the bed-plate of a sewing-machine provided. with my improved latch, the latter being in closed or operative position relative to the bobbin-case. Fig. 2 is a plan view of the latch and its supportingplate detached from the machine. Fig. 3is a front view of the same with certain of the parts broken away and in section. Fig. 4; is a vertical cross-section. through certain of the parts, showing the relative positions of the latch and its holding device when the latch is in closed or operative position.

In the drawings, the bed-plate a, the rotary shuttle b, the shuttle-raceway casement b," the bobbin 0, and the bobbin-case c are all of usual construction and arrangement, as found in the Standard sewing-machine, to which in the present instance I have applied myimp'roved bobbin-case latch. This latch comprises a horizontally-swinging bar, (indicatedat d,) which is pivoted at one end to a supporting-block d on the under side of the bed-plate and at its opposite or free end is movable to and froma position in front of the bobbin-case to hold the same in its position within the shuttle. As a simple and convenient means for holding the latch in its operative or closed position in engagement with the bobbin-case I have supported a pine in a movable position within a pocket one side thereof and hold it in closed position,

as shown. This pin 8 is supported to have a sliding movement within its opening in the block 61', so as to be movable to and from its said normal position for engaging with the latch, the same being yieldingly held in such normal position by means of a spring e, as shown in Fig. 3. By this arrangement of the holding-pin 6 when it is desired to remove the bobbin and bobbin-case the operator will simply grasp the end of the latch and draw the same outwardly from its closed position, such movement of the latch operating to force the pin e upward and away from its holding position relative thereto. To again close the latch after the bobbin and bobbin-case have been replaced in the shuttle, it is only neces sary for the operator to push it to its closed position, as the pin is readily forced out of the path of the latch during the movement of thelatterthereunder. Toinsure the ready passage of the latch past the holding-pin in the manner described, the end of said pin is made somewhat pointed and the adjacent sides of the latch beveled, as shown.

The bobbin-case,-in addition to being retained within the shuttle, should also be held in 'a non-rotatable position therein. To efiect this, I have provided the latch with an arm d which when the latch is in its closed or operative position is adapted to extend into an opening or recess 0 formed in the face of the bobbin-case and hold the latter against rotary movement, the end of said arm fitting loosely Within the opening or recess ofthe bobbin-case, so as not to interfere with the free passage of the needle-thread loop between the same. I

When the latch is closed, it should engage with the bobbin-case so loosely as to permit of the free passage of the needle-thread loop between the same. In order, therefore, to properly regulate the position of the latch relative to the bobbin-case when in its closed ed, is in the present case detachably secured in position on the underside of the bed-plate of the machine in order that the parts may be more conveniently assembled before being placed in position on the machine and also in order to permit of their more ready removal for the purposesof repair, adjustment, or otherwise.

What I claim as new, and desire to secure by Letters Patent of the United States, is-

1. In a sewing-machine, the combination,

with a shuttle, bobbin and bobbin-case, of aswinging latch for retaining said bobbin-case in position and having means for holding the same against rotary movement, and a movably-supported catch device normally held in position for engaging with the latch to hold the same in its operative closed position, the said catch device being movable from its holding posit-ion by the engagement therewith of the latch upon the openingof the latter.

2. In a sewing-machine, the combination, with a shuttle, bobbin and bobbin-case, of a swinging latch for retaining said bobbin-case in position and having means for holding the same against rotary movement, a yieldinglysupported catch device normally held in position for engaging with the latch to hold the same in its operative closed position, and means whereby said catch device may be moved from its normal position by the latch upon the opening and closing of the latter.

3. In a sewing-machine, the combination, with the shuttle, bobbin and bobbin-case, of a swinging latch for retaining said bobbincasein position, an adjustable stop device carried by the latch for regulating its position relative to the bobbin-case, and means for holding the latch in its closed positi0n,-the said means being movable from holding position by the engagement therewith of the latch upon the opening of the latter.

4:. In a sewing-machine, the combination, with the bobbin-case, of a swinging latch for retaining said bobbin-case in position, an adjustable stop device carried by the latch, and a spring-pressed pin for holding the latch in its closed position, the said pin being movable from holding position by the engagement therewith of the latch upon the opening of the latter..

5. In a sewing-machine, the combination, with the bobbin-case, of a swinging latch for retaining said bobbin-case in position and having oppositely-beveled sides adjacent to one edge thereof, and a longitudinally-movable spring-pressed pin having a tapering end for engaging with the beveled sides of said latch, for the purpose set forth.

WILLIAM A. MACK.

Witnesses:

GEo. D. GLAss, GEO. P. SMITH. 

